Aang and his new friends visit the Southern Air Temple where they meet a winged lemur, who Aang later names Momo.

Aang also learns that he was in the ice for a whole century and that the Fire Nation wiped out all of the Air Nomads, including his guardian, Monk Gyatso.

A century has passed since the Fire Nation has declared war on the other 3 nations of Air, Water, and Earth in their attempt to conquer the world.

Zuko is the scarred 16-year-old exiled prince of the Fire Nation on a quest to find the Avatar and bring him to his father, Fire Lord Ozai, so he can regain his honor.

After a few agreements, a waterbending master, Pakku, teaches Aang waterbending.

Katara also becomes a much stronger and more powerful waterbender due to her training with Master Pakku.

Aang tells Katara and Sokka that he only knows airbending and he must master the other three elements.

Katara is given a waterbending scroll that she uses to greatly strengthen and hone her waterbending abilities and to help Aang learn as they make their way to the Northern Water Tribe (where Aang will be able to learn from waterbending masters) and liberate more Earth Kingdom villages in the process, weakening the Fire Nation's food and water supplies.

Noticing the danger, Zuko manages to survive the attempt on his life with Iroh's help.

He sneaks aboard Zhao's lead ship as his fleet departs for the Northern Water Tribe, which is a heavy fortress, to capture the Avatar.

Iroh, enraged by Zhao's disrespect for sacredness and by his actions to unbalance the world, reveals the extent of his mastery of firebending by using his chi to create huge flame jets from his wrists, scaring Zhao and his entourage of Fire Nation Soldiers out of the sacred cave.